solid, metallic
Through waves
gamma radiationA2 perhaps neutrons.
Sound waves travel through matter. Our atmosphere is a mixture of gases which is a form of matter. Sound waves will travel through our atmosphere, even if there is no human ear to receive it.
Particles. They can't travel through a vacumm
An object is a good conductor when electricity, heat or another form of energy can travel through it easily.
Electromagnetic waves are a form of energy that result from the vibration of electrically charged particles. These waves consist of oscillating electric and magnetic fields that can travel through vacuum or matter at the speed of light.
One example would be X-Rays. They are stopped by Lead, but travel through other matter and empty space.
Sound waves travel through a medium, such as air, water, or solids. In air, sound waves create vibrations that travel through molecules in the form of pressure waves. These waves carry the sound energy and allow the sound to be heard by our ears.
Sound energy is produced when matter vibrates. This vibration creates waves that travel through a medium, such as air or water, and are interpreted by our ears as sound.
Radiation
The answer will depend on who is Carry and what his energy is doing in empty space.
Sound travels from place to place in the form of pressure waves in matter such as air, water, rock or soil.